zerodds-spy

Subscribe to a DDS topic and dump samples — like tcpdump for DDS.

The tool starts a DcpsRuntime, registers an untyped reader on the named topic, and prints metadata + an optional hex snippet of every incoming sample until you Ctrl-C, hit a sample-count limit, or a duration elapses.

Usage

# Subscribe to topic Foo on default domain (0) until Ctrl-C
zerodds-spy -t Foo

# Capture exactly 50 samples
zerodds-spy -t Foo -n 50

# 10s burst, dump only first 8 hex bytes per sample
zerodds-spy -t Foo --duration 10s --hex 8

# Subscribe on domain 5
zerodds-spy -d 5 -t Sensor/Stream/A

Output

Each sample is printed as one line:

[     1] writer=000003c2 bytes=64 deadbeef cafebabe 12345678 90abcdef
[     2] writer=000003c2 bytes=64 deadbeef cafebabe 12345678 90abcdef
...

Lifecycle markers (Disposed / Unregistered) are printed as [lifecycle] <kind>.

Exit Codes